Electrolux # Посібник з експлуатації - Сторінка 9

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The following is a description of component functions dur-

ing oven operation.

OFF CONDITION

Closing the door activates the door sensing switch and

secondary interlock switch. (In this condition, the monitor

switch contacts are opened.)

When oven is plugged in, 20 volts A.C. is supplied to the

control unit. (Figure O-).

. The display will show "WELCOME, PRESS CLEAR AND

PRESS CLOCK".

To set any program or set the clock, you must first touch

the STOP/CLEAR pad. The display will clear, and " : "

will appear .

COOKING CONDITION

Program desired cooking time touching the NUMBER pads.

When the START pad is touched, the following operations

occur:

. The contacts of relays are closed and components

connected to the relays are turned on as follows.

(For details, refer to Figure O-2)

RELAY

CONNECTED COMPONENTS

Oven lamp / Fan motor / Stirrer motor

RY2

Power transformer

RY3

Turntable motor

RY4

Hood fan motor

2. 20 volts A.C. is supplied to the primary winding of the

power transformer and is converted to about 3.3 volts

A.C. output on the filament winding, and approximately

2000 volts A.C. on the high voltage winding.

3. The filament winding voltage heats the magnetron

filament and the H.V. winding voltage is sent to a voltage

doubler circuit.

4. The microwave energy produced by the magnetron is

channelled through the waveguide into the cavity feed-

box, and then into the cavity where the food is placed

to be cooked.

5. Upon completion of the cooking time, the power

transformer, oven lamp, etc. are turned off, and the

generation of microwave energy is stopped. The oven

will revert to the OFF condition.

6. When the door is opened during a cook cycle, monitor

switch, door sensing switch, primary interlock switch,

and secondary interlock relay are activated with the

following results. The circuits to the stirrer motor, the

cooling fan motor, the turntable motor, and the high

voltage components are de-energized, and the digital

read-out displays the time still remaining in the cook

cycle when the door was opened.

7. The monitor switch is electrically monitoring the operation

of the primary interlock switch, and door sensing switch

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

is mechanically associated with the door so that it will

function in the following sequence.

() When the door opens from a closed position, the

secondary interlock relay, door sensing switch, and

primary interlock switch open their contacts, and

then the monitor switch contacts close.

(2) When the door is closed from the open position,

the monitor switch contacts open first. Then the

contacts of the primary interlock switch and door

sensing switch close. And contacts of the relay

(RY) open.

If the primary interlock switch and secondary interlock

relay (RY2) fail with the contacts closed when the door

is opened, the closing of the monitor switch contacts will

form a short circuit through the monitor fuse, primary

interlock switch, relay (RY) and secondary interlock

relay (RY2), causing the monitor fuse to blow.

POWER LEVEL P-0 TO P-90 COOKING

When Variable Cooking Power is programmed, the 20

volts A.C. is supplied to the power transformer intermittently

through the contacts of relay (RY2) which is operated by the

control unit within an interval second time base. Microwave

power operation is as follows:

VARI-MODE

ON TIME

Power 0(P-HI)

(00% power)

Power 9(P-90)

(approx. 90% power)

Power 8(P-80)

(approx. 80% power)

Power 7(P-70)

(approx. 70% power)

Power 6(P-60)

(approx. 60% power)

Power 5(P-50)

(approx. 50% power)

Power 4(P-40)

(approx. 40% power)

Power 3(P-30)

(approx. 30% power)

Power 2(P-20)

(approx. 20% power)

Power (P-0)

(approx. 0% power)

Power 0(P-0)

(0% power)

Note: The ON/OFF time ratio does not correspond with the

percentage of microwave power, because approx. 2

seconds are needed for heating of the magnetron

filament.

OFF TIME

32 sec.

0 sec.

30 sec.

2 sec.

26 sec.

6 sec.

24 sec.

8 sec.

22 sec.

0 sec.

8 sec.

4 sec.

6 sec.

2 sec.

20 sec.

8 sec.

24 sec.

6 sec.

26 sec.

0 sec.

32 sec.